books

• Light and matter -- introductory physics for students majoring in the life sciences
• Mechanics
• Fields and circuits
• Modern physics
• Conceptual physics
• Problems in introductory physics
• Fundamentals of calculus
• Relativity for poets
• Special relativity
• General relativity

open-source software

• Spotter - a program that lets students check their answers to math and science questions
• OpenGrade - software for teachers to keep track of grades
• When - an extremely simple personal calendar program, aimed at the Unix geek who wants something minimalistic